Why Do We Kiss?

Hank gets all up in your face about kissing -- where does it come from, why do it we do it, and do other animals do it? From ancient India to that date you were on last night (which we won't tell anyone about if you won't), we explore the history of snogging and its role in human evolution.

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Sources for this episode:
http://news.discovery.com/history/his...
http://www.nytimes.com/2006/04/06/fas...
http://www.livescience.com/32464-why-...
http://www.nypost.com/p/news/opinion/...
http://news.nationalgeographic.com/ne...
http://people.howstuffworks.com/kissi...
http://www.psychologytoday.com/blog/l...
http://www.cnn.com/2009/HEALTH/02/13/...